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adc: use single float literals

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Dramatic performance improvement on m4f cores, ~1600->80 cycles
This commit is contained in:
Karl Palsson 2016-03-30 17:15:06 +00:00
parent fc590297eb
commit 614482176c
1 changed files with 3 additions and 3 deletions
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6
tests/adc-power/adc-power.c
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@ -117,12 +117,12 @@ static uint16_t read_adc_naiive(uint8_t channel)
}
static float adc_calc_tempf(unsigned int ts_v, unsigned int vref) {
float adjusted_vtemp = ts_v * ST_VREFINT_CAL * 1.0 / vref * 1.0;
float slope = (110-30) * 1.0 / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C) * 1.0;
float adjusted_vtemp = ts_v * ST_VREFINT_CAL * 1.0f / vref * 1.0f;
float slope = (110-30) * 1.0f / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C) * 1.0f;
return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;
}
static float adc_calc_tempi(uint16_t ts, uint16_t vref) {
static int adc_calc_tempi(unsigned int ts, unsigned int vref) {
int adjusted_vtemp = ts * ST_VREFINT_CAL / vref;
int slope = (110-30) / (ST_TSENSE_CAL2_110C - ST_TSENSE_CAL1_30C);
return slope * (adjusted_vtemp - ST_TSENSE_CAL1_30C) + 30;